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published by the PhET
Available Languages: English, French, Spanish
This Java simulation experiments with a helium balloon, a hot air balloon, or a rigid sphere filled with different gases. The user can discover what makes some balloons float and others sink. Teaching ideas and activities are included.

Note:  As of 2020, the PhET Project has partnered with Leaning Technologies to allow Java sims to run in a PC browser via CheerpJ. May currently not run on iPads.

Please note that this resource requires Java Applet Plug-in.
Subjects Levels Resource Types
Fluid Mechanics
- General
- Statics of Fluids
= Density and Buoyancy
Thermo & Stat Mech
- Models
= Ideal Gas
- Lower Undergraduate
- High School
- Informal Education
- Instructional Material
= Activity
= Curriculum support
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
- text/html
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Access Rights:
Free access
© 2007 University of Colorado, Physics Education Technology
Additional information is available.
Gas law, buoyancy, fluids, gas , pressure, temperature, thermodynamics
Record Cloner:
Metadata instance created November 15, 2007 by Alea Smith
Record Updated:
October 30, 2020 by Caroline Hall
Last Update
when Cataloged:
November 15, 2007
Other Collections:

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Record Link
AIP Format
(PhET, Boulder, 2007), WWW Document, (
PhET Simulation: Balloons & Buoyancy (PhET, Boulder, 2007), <>.
APA Format
PhET Simulation: Balloons & Buoyancy. (2007, November 15). Retrieved June 20, 2024, from PhET:
Chicago Format
PhET. PhET Simulation: Balloons & Buoyancy. Boulder: PhET, November 15, 2007. (accessed 20 June 2024).
MLA Format
PhET Simulation: Balloons & Buoyancy. Boulder: PhET, 2007. 15 Nov. 2007. 20 June 2024 <>.
BibTeX Export Format
@misc{ Title = {PhET Simulation: Balloons & Buoyancy}, Publisher = {PhET}, Volume = {2024}, Number = {20 June 2024}, Month = {November 15, 2007}, Year = {2007} }
Refer Export Format

%T PhET Simulation: Balloons & Buoyancy %D November 15, 2007 %I PhET %C Boulder %U %O application/java

EndNote Export Format

%0 Electronic Source %D November 15, 2007 %T PhET Simulation: Balloons & Buoyancy %I PhET %V 2024 %N 20 June 2024 %8 November 15, 2007 %9 application/java %U

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Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Electronic References.

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